<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Button Ripple Effect</title>
    <script>
        window.onload = function(){
            const buttons = document.querySelectorAll('.ripple')
            buttons.forEach(button =>{
                button.addEventListener('click',function(e){
                    const x = e.clientX
                    const y = e.clientY

                    const buttonTop = e.target.offsetTop
                    const buttonLeft = e.target.offsetLeft

                    const xInside = x - buttonLeft
                    const yInside = y - buttonTop

                    const circle = document.createElement('span')
                    circle.classList.add('circle')
                    circle.style.top = yInside+'px'
                    circle.style.left = xInside+'px'

                    this.appendChild(circle)

                    setTimeout(()=>circle.remove(), 500);
                })
            })
        }
    </script>
    <style>
        *{
            box-sizing: border-box;
        }

        body{
            background-color: #fff;
            font-family: 'Roboto',sans-serif;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            height: 100vh;
            overflow: hidden;
            margin: 0;
        }
        button{
            background-color: purple;
            color: #fff;
            border: 1px purple solid;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 2px ;
            padding: 20px 30px;
            overflow: hidden;
            margin: 10px 0;
            position: relative;
        }
        
        button:focus{
            outline: none;
        }

        button .circle{
            position: absolute;
            background-color: #fff;
            width: 100px;
            height: 100px;
            border-radius: 50%;
            transform: translate(-50%,-50%) scale(0);
            animation: scale 0.5s ease-out;
        }
        @keyframes scale{
            to{
                transform: translate(-50%,-50%) scale(3);
                opacity: 0;
            }
        }
    </style>
</head>
<body>
    <button class="ripple">Click Me</button>
</body>
</html>